Help/Support keep current game status / achivements

[NightDragon16 0 iPad Pro (2nd, 10.5'') 13.4]

hi there, i just can't find the answer to my question in the forum...
so how can i keep my game status / achivements after the certificate has been revoked? 
after reinstalling the app (with the same name etc.) i have to start playing from the very beginning...
this happened 2 times in the 2 weeks i own the app+ membership.
i mainly play "merge dragons" which i custom installed if that helps. did not want to delete and replace the official app since i also would loose my game status. 
i read something about backing up the app to keep the status. but do not know how to do that and how to get it back from the backup. 
maybe all of this is explained somewhere already?
thanks so much guys!!!

[Laxus 814.7k iPhone 5s 10.3.3]

Most game usually use gamecenter or facebook login to save progress

[Tbig10diego 1 iPhone 7 13.3.1]

Hola kiero decirles gracias es muy buena la aplicación pero kiero descargar juegos y cuando le doy a instalar kiere que inicie sesión pero cuando pongo mi cuenta no me kiere dejar iniciar he puesta barrías y he creado y le pongo esa cuenta y no me deja iniciar sección que hago 

[NightDragon16 0 iPad Pro (2nd, 10.5'') 13.4]

6 hours ago, Laxus said:

Most game usually use gamecenter or facebook login to save progress

thanks! would this also work with the custom installed apps or only if i delete the official app and replace it with the hacked one?

[NightDragon16 0 iPad Pro (2nd, 10.5'') 13.4]

On 6/10/2020 at 4:31 PM, Laxus said:

Most game usually use gamecenter or facebook login to save progress

now i found it. this is acutally the case! thanks a lot! 
but... that works with merge dragons only if the games have the same version number. 
so i must wait now for the current version number to be hacked...

[NightDragon16 0 iPad Pro (2nd, 10.5'') 13.4]

for many weeks now this game is absent from the iosgods app+

do you know what the reason could be? i am a little desperate 😩